The more you have good pokeradar chains, the better you'll find one in wild while fishing. Or evolve a shiny Magikarp.
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Yes, the "Red Gyarados" is actually just a shiny Gyarados.
well theres a very low percent that you can find one but in Pokemon heartgold/soul silver theres one in a lake
technically, yes. There is an 8462 to one chance of finding a shiny pokemon. If you found a shiny gyarados, it WOULD be red. You could also evolve a shiny magicarp(which, by the way, is gold). No, there is no guarantee on this, and there is no guaranteed chance of finding a red gyarados.
khadels backyard
No, Gyarados and red Gyarados are basically the same having only one key difference; red Gyarados is a "shiny" Pokemon which changes its color and makes it rare to find in normal gameplay.